[1] World Intellectual Property Org, Dept Econ & Data Analyt, 34,Chemin Colombettes, CH-1211 Geneva, Switzerland
[2] Univ Bundeswehr Munich, Dept Business Adm, Werner Heisenberg Weg 39, DE-85577 Neubiberg, Germany
[3] Max Planck Inst Innovat & Competit, Marstallpl 1, DE-80539 Munich, Germany
[4] German Econ Inst IW Cologne, Konrad Adenauer Ufer 21, DE-50668 Cologne, Germany